#include <QWidget>
#include <QRecursiveMutex>
#include <QIcon>
+#include <algorithm>
Q_GLOBAL_STATIC(QRecursiveMutex, s_collatorMutex)
ItemData* data = m_itemData.at(index);
if (data->values.isEmpty()) {
data->values = retrieveData(data->item, data->parent);
+ } else if (data->values.count() <= 2 && data->values.value("isExpanded").toBool()) {
+ // Special case dealt by slotRefreshItems(), avoid losing the "isExpanded" and "expandedParentsCount" state when refreshing
+ // slotRefreshItems() makes sure folders keep the "isExpanded" and "expandedParentsCount" while clearing the remaining values
+ // so this special request of different behavior can be identified here.
+ bool hasExpandedParentsCount = false;
+ const int expandedParentsCount = data->values.value("expandedParentsCount").toInt(&hasExpandedParentsCount);
+
+ data->values = retrieveData(data->item, data->parent);
+ data->values.insert("isExpanded", true);
+ if (hasExpandedParentsCount) {
+ data->values.insert("expandedParentsCount", expandedParentsCount);
+ }
}
return data->values;
ItemData *itemData = m_itemData.at(index);
if (m_filter.matches(itemData->item)
- || (itemShownBelow && itemShownBelow->parent == itemData && itemData->values.value("isExpanded").toBool())) {
+ || (itemShownBelow && itemShownBelow->parent == itemData)) {
// We could've entered here for two reasons:
// 1. This item passes the filter itself
// 2. This is an expanded folder that doesn't pass the filter but sees a filter-passing child just below
{
Q_ASSERT(!items.isEmpty());
- QUrl parentUrl;
- if (m_expandedDirs.contains(directoryUrl)) {
- parentUrl = m_expandedDirs.value(directoryUrl);
- } else {
- parentUrl = directoryUrl.adjusted(QUrl::StripTrailingSlash);
- }
+ const QUrl parentUrl = m_expandedDirs.value(directoryUrl, directoryUrl.adjusted(QUrl::StripTrailingSlash));
if (m_requestRole[ExpandedParentsCountRole]) {
// If the expanding of items is enabled, the call
if (!m_filter.hasSetFilters()) {
m_pendingItemsToInsert.append(itemDataList);
} else {
+ QSet<ItemData *> parentsToEnsureVisible;
+
// The name or type filter is active. Hide filtered items
// before inserting them into the model and remember
// the filtered items in m_filteredItems.
for (ItemData* itemData : itemDataList) {
if (m_filter.matches(itemData->item)) {
m_pendingItemsToInsert.append(itemData);
+ if (itemData->parent) {
+ parentsToEnsureVisible.insert(itemData->parent);
+ }
} else {
m_filteredItems.insert(itemData->item, itemData);
}
}
+
+ // Entire parental chains must be shown
+ for (ItemData *parent : parentsToEnsureVisible) {
+ for (; parent && m_filteredItems.remove(parent->item); parent = parent->parent) {
+ m_pendingItemsToInsert.append(parent);
+ }
+ }
}
if (!m_maximumUpdateIntervalTimer->isActive()) {
Q_EMIT fileItemsChanged({KFileItem(directoryUrl)});
}
+int KFileItemModel::filterChildlessParents(KItemRangeList &removedItemRanges, const QSet<ItemData *> &parentsToEnsureVisible)
+{
+ int filteredParentsCount = 0;
+ // The childless parents not yet removed will always be right above the start of a removed range.
+ // We iterate backwards to ensure the deepest folders are processed before their parents
+ for (int i = removedItemRanges.size() - 1; i >= 0; i--) {
+ KItemRange itemRange = removedItemRanges.at(i);
+ const ItemData *const firstInRange = m_itemData.at(itemRange.index);
+ ItemData *itemAbove = itemRange.index - 1 >= 0 ? m_itemData.at(itemRange.index - 1) : nullptr;
+ const ItemData *const itemBelow = itemRange.index + itemRange.count < m_itemData.count() ? m_itemData.at(itemRange.index + itemRange.count) : nullptr;
+
+ if (itemAbove && firstInRange->parent == itemAbove && !m_filter.matches(itemAbove->item) && (!itemBelow || itemBelow->parent != itemAbove)
+ && !parentsToEnsureVisible.contains(itemAbove)) {
+ // The item above exists, is the parent, doesn't pass the filter, does not belong to parentsToEnsureVisible
+ // and this deleted range covers all of its descendents, so none will be left.
+ m_filteredItems.insert(itemAbove->item, itemAbove);
+ // This range's starting index will be extended to include the parent above:
+ --itemRange.index;
+ ++itemRange.count;
+ ++filteredParentsCount;
+ KItemRange previousRange = i > 0 ? removedItemRanges.at(i - 1) : KItemRange();
+ // We must check if this caused the range to touch the previous range, if that's the case they shall be merged
+ if (i > 0 && previousRange.index + previousRange.count == itemRange.index) {
+ previousRange.count += itemRange.count;
+ removedItemRanges.replace(i - 1, previousRange);
+ removedItemRanges.removeAt(i);
+ } else {
+ removedItemRanges.replace(i, itemRange);
+ // We must revisit this range in the next iteration since its starting index changed
+ ++i;
+ }
+ }
+ }
+ return filteredParentsCount;
+}
+
void KFileItemModel::slotItemsDeleted(const KFileItemList& items)
{
dispatchPendingItemsToInsert();
indexesToRemove = indexesToRemoveWithChildren;
}
- const KItemRangeList itemRanges = KItemRangeList::fromSortedContainer(indexesToRemove);
+ KItemRangeList itemRanges = KItemRangeList::fromSortedContainer(indexesToRemove);
removeFilteredChildren(itemRanges);
- removeItems(itemRanges, DeleteItemData);
+
+ // This call will update itemRanges to include the childless parents that have been filtered.
+ const int filteredParentsCount = filterChildlessParents(itemRanges);
+
+ // If any childless parents were filtered, then itemRanges got updated and now contains items that were really deleted
+ // mixed with expanded folders that are just being filtered out.
+ // If that's the case, we pass 'DeleteItemDataIfUnfiltered' as a hint
+ // so removeItems() will check m_filteredItems to differentiate which is which.
+ removeItems(itemRanges, filteredParentsCount > 0 ? DeleteItemDataIfUnfiltered : DeleteItemData);
Q_EMIT fileItemsChanged(dirsChanged);
}
QList<ItemData*> newVisibleItems;
QListIterator<QPair<KFileItem, KFileItem> > it(items);
+
while (it.hasNext()) {
const QPair<KFileItem, KFileItem>& itemPair = it.next();
const KFileItem& oldItem = itemPair.first;
}
m_items.remove(oldItem.url());
- if (newItemMatchesFilter) {
- m_items.insert(newItem.url(), indexForItem);
+ // We must maintain m_items consistent with m_itemData for now, this very loop is using it.
+ // We leave it to be cleared by removeItems() later, when m_itemData actually gets updated.
+ m_items.insert(newItem.url(), indexForItem);
+ if (newItemMatchesFilter
+ || (itemData->values.value("isExpanded").toBool()
+ && (indexForItem + 1 < m_itemData.count() && m_itemData.at(indexForItem + 1)->parent == itemData))) {
+ // We are lenient with expanded folders that originally had visible children.
+ // If they become childless now they will be caught by filterChildlessParents()
changedFiles.append(newItem);
indexes.append(indexForItem);
} else {
// Check if 'oldItem' is one of the filtered items.
QHash<KFileItem, ItemData*>::iterator it = m_filteredItems.find(oldItem);
if (it != m_filteredItems.end()) {
- ItemData* itemData = it.value();
+ ItemData *const itemData = it.value();
itemData->item = newItem;
// The data stored in 'values' might have changed. Therefore, we clear
// 'values' and re-populate it the next time it is requested via data(int).
+ // Before clearing, we must remember if it was expanded and the expanded parents count,
+ // otherwise these states would be lost. The data() method will deal with this special case.
+ const bool isExpanded = itemData->values.value("isExpanded").toBool();
+ bool hasExpandedParentsCount = false;
+ const int expandedParentsCount = itemData->values.value("expandedParentsCount").toInt(&hasExpandedParentsCount);
itemData->values.clear();
+ if (isExpanded) {
+ itemData->values.insert("isExpanded", true);
+ if (hasExpandedParentsCount) {
+ itemData->values.insert("expandedParentsCount", expandedParentsCount);
+ }
+ }
m_filteredItems.erase(it);
if (newItemMatchesFilter) {
}
}
- // Hide items, previously visible that should get hidden
- const KItemRangeList removedRanges = KItemRangeList::fromSortedContainer(newFilteredIndexes);
+ std::sort(newFilteredIndexes.begin(), newFilteredIndexes.end());
+
+ // We must keep track of parents of new visible items since they must be shown no matter what
+ // They will be considered "immune" to filterChildlessParents()
+ QSet<ItemData *> parentsToEnsureVisible;
+
+ for (ItemData *item : newVisibleItems) {
+ for (ItemData *parent = item->parent; parent && !parentsToEnsureVisible.contains(parent); parent = parent->parent) {
+ parentsToEnsureVisible.insert(parent);
+ }
+ }
+ for (ItemData *parent : parentsToEnsureVisible) {
+ // We make sure they are all unfiltered.
+ if (m_filteredItems.remove(parent->item)) {
+ // If it is being unfiltered now, we mark it to be inserted by appending it to newVisibleItems
+ newVisibleItems.append(parent);
+ // It could be in newFilteredIndexes, we must remove it if it's there:
+ const int parentIndex = index(parent->item);
+ if (parentIndex >= 0) {
+ QVector<int>::iterator it = std::lower_bound(newFilteredIndexes.begin(), newFilteredIndexes.end(), parentIndex);
+ if (it != newFilteredIndexes.end() && *it == parentIndex) {
+ newFilteredIndexes.erase(it);
+ }
+ }
+ }
+ }
+
+ KItemRangeList removedRanges = KItemRangeList::fromSortedContainer(newFilteredIndexes);
+
+ // This call will update itemRanges to include the childless parents that have been filtered.
+ filterChildlessParents(removedRanges, parentsToEnsureVisible);
+
removeItems(removedRanges, KeepItemData);
// Show previously hidden items that should get visible
insertItems(newVisibleItems);
+ // Final step: we will emit 'itemsChanged' and 'fileItemsChanged' signals and trigger the asynchronous re-sorting logic.
+
// If the changed items have been created recently, they might not be in m_items yet.
// In that case, the list 'indexes' might be empty.
if (indexes.isEmpty()) {
return;
}
+ if (newVisibleItems.count() > 0 || removedRanges.count() > 0) {
+ // The original indexes have changed and are now worthless since items were removed and/or inserted.
+ indexes.clear();
+ // m_items is not yet rebuilt at this point, so we use our own means to resolve the new indexes.
+ const QSet<const KFileItem> changedFilesSet(changedFiles.cbegin(), changedFiles.cend());
+ for (int i = 0; i < m_itemData.count(); i++) {
+ if (changedFilesSet.contains(m_itemData.at(i)->item)) {
+ indexes.append(i);
+ }
+ }
+ } else {
+ std::sort(indexes.begin(), indexes.end());
+ }
+
// Extract the item-ranges out of the changed indexes
- std::sort(indexes.begin(), indexes.end());
const KItemRangeList itemRangeList = KItemRangeList::fromSortedContainer(indexes);
emitItemsChangedAndTriggerResorting(itemRangeList, changedRoles);
removedItemsCount += range.count;
for (int index = range.index; index < range.index + range.count; ++index) {
- if (behavior == DeleteItemData) {
+ if (behavior == DeleteItemData || (behavior == DeleteItemDataIfUnfiltered && !m_filteredItems.contains(m_itemData.at(index)->item))) {
delete m_itemData.at(index);
}
determineMimeTypes(items, 200);
}
+ // We search for the parent in m_itemData and then in m_filteredItems if necessary
const int parentIndex = index(parentUrl);
- ItemData* parentItem = parentIndex < 0 ? nullptr : m_itemData.at(parentIndex);
+ ItemData *parentItem = parentIndex < 0 ? m_filteredItems.value(KFileItem(parentUrl), nullptr) : m_itemData.at(parentIndex);
QList<ItemData*> itemDataList;
itemDataList.reserve(items.count());
enum RemoveItemsBehavior {
KeepItemData,
- DeleteItemData
+ DeleteItemData,
+ DeleteItemDataIfUnfiltered
};
void insertItems(QList<ItemData*>& items);
*/
bool isConsistent() const;
+ /**
+ * Filters out the expanded folders that don't pass the filter themselves and don't have any filter-passing children.
+ * Will update the removedItemRanges arguments to include the parents that have been filtered.
+ * @returns the number of parents that have been filtered.
+ * @param removedItemRanges The ranges of items being deleted/filtered, will get updated
+ * @param parentsToEnsureVisible Parents that must be visible no matter what due to being ancestors of newly visible items
+ */
+ int filterChildlessParents(KItemRangeList &removedItemRanges, const QSet<ItemData *> &parentsToEnsureVisible = QSet<ItemData *>());
+
private:
KDirLister *m_dirLister = nullptr;
void testNameFilter();
void testEmptyPath();
void testRefreshExpandedItem();
+ void testAddItemToFilteredExpandedFolder();
+ void testDeleteItemsWithExpandedFolderWithFilter();
+ void testRefreshItemsWithFilter();
+ void testRefreshExpandedFolderWithFilter();
void testRemoveHiddenItems();
void collapseParentOfHiddenItems();
void removeParentOfHiddenItems();
QVERIFY(m_model->isExpanded(0));
}
+/**
+ * Verifies that adding an item to an expanded folder that's filtered makes the parental chain visible.
+ */
+void KFileItemModelTest::testAddItemToFilteredExpandedFolder()
+{
+ QSignalSpy itemsInsertedSpy(m_model, &KFileItemModel::itemsInserted);
+ QSignalSpy fileItemsChangedSpy(m_model, &KFileItemModel::fileItemsChanged);
+
+ QSet<QByteArray> modelRoles = m_model->roles();
+ modelRoles << "isExpanded" << "isExpandable" << "expandedParentsCount";
+ m_model->setRoles(modelRoles);
+
+ m_testDir->createFile("a/b/file");
+
+ m_model->loadDirectory(m_testDir->url());
+ QVERIFY(itemsInsertedSpy.wait());
+ QCOMPARE(m_model->count(), 1); // "a
+
+ // Expand "a/".
+ m_model->setExpanded(0, true);
+ QVERIFY(itemsInsertedSpy.wait());
+
+ // Expand "a/b/".
+ m_model->setExpanded(1, true);
+ QVERIFY(itemsInsertedSpy.wait());
+
+ QCOMPARE(m_model->count(), 3); // 3 items: "a/", "a/b/", "a/b/file"
+
+ const QUrl urlB = m_model->fileItem(1).url();
+
+ // Set a filter that matches ".txt" extension
+ m_model->setNameFilter("*.txt");
+ QCOMPARE(m_model->count(), 0); // Everything got hidden since we don't have a .txt file yet
+
+ m_model->slotItemsAdded(urlB, KFileItemList() << KFileItem(QUrl("a/b/newItem.txt")));
+ m_model->slotCompleted();
+
+ // Entire parental chain should now be shown
+ QCOMPARE(m_model->count(), 3); // 3 items: "a/", "a/b/", "a/b/newItem.txt"
+ QCOMPARE(itemsInModel(), QStringList() << "a" << "b" << "newItem.txt");
+
+ // Items should be indented in hierarchy
+ QCOMPARE(m_model->expandedParentsCount(0), 0);
+ QCOMPARE(m_model->expandedParentsCount(1), 1);
+ QCOMPARE(m_model->expandedParentsCount(2), 2);
+}
+
+/**
+ * Verifies that deleting the last filter-passing child from expanded folders
+ * makes the parental chain hidden.
+ */
+void KFileItemModelTest::testDeleteItemsWithExpandedFolderWithFilter()
+{
+ QSignalSpy itemsInsertedSpy(m_model, &KFileItemModel::itemsInserted);
+ QSignalSpy itemsRemovedSpy(m_model, &KFileItemModel::itemsRemoved);
+
+ QSet<QByteArray> modelRoles = m_model->roles();
+ modelRoles << "isExpanded" << "isExpandable" << "expandedParentsCount";
+ m_model->setRoles(modelRoles);
+
+ m_testDir->createFile("a/b/file");
+
+ m_model->loadDirectory(m_testDir->url());
+ QVERIFY(itemsInsertedSpy.wait());
+ QCOMPARE(m_model->count(), 1); // "a
+
+ // Expand "a/".
+ m_model->setExpanded(0, true);
+ QVERIFY(itemsInsertedSpy.wait());
+
+ // Expand "a/b/".
+ m_model->setExpanded(1, true);
+ QVERIFY(itemsInsertedSpy.wait());
+
+ QCOMPARE(m_model->count(), 3); // 3 items: "a/", "a/b/", "a/b/file"
+
+ // Set a filter that matches "file" extension
+ m_model->setNameFilter("file");
+ QCOMPARE(m_model->count(), 3); // Everything is still shown
+
+ // Delete "file"
+ QCOMPARE(itemsRemovedSpy.count(), 0);
+ m_model->slotItemsDeleted(KFileItemList() << m_model->fileItem(2));
+ QCOMPARE(itemsRemovedSpy.count(), 1);
+
+ // Entire parental chain should now be filtered
+ QCOMPARE(m_model->count(), 0);
+ QCOMPARE(m_model->m_filteredItems.size(), 2);
+}
+
+/**
+ * Verifies that the fileItemsChanged signal is raised with the correct index after renaming files with filter set.
+ * The rename operation will cause one item to be filtered out and another item to be reordered.
+ */
+void KFileItemModelTest::testRefreshItemsWithFilter()
+{
+ QSignalSpy itemsInsertedSpy(m_model, &KFileItemModel::itemsInserted);
+ QSignalSpy itemsRemovedSpy(m_model, &KFileItemModel::itemsRemoved);
+ QSignalSpy itemsChangedSpy(m_model, &KFileItemModel::itemsChanged);
+ QSignalSpy itemsMovedSpy(m_model, &KFileItemModel::itemsMoved);
+
+ // Creates three .txt files
+ m_testDir->createFiles({"b.txt", "c.txt", "d.txt"});
+
+ m_model->loadDirectory(m_testDir->url());
+ QVERIFY(itemsInsertedSpy.wait());
+
+ QCOMPARE(m_model->count(), 3); // "b.txt", "c.txt", "d.txt"
+
+ // Set a filter that matches ".txt" extension
+ m_model->setNameFilter("*.txt");
+ QCOMPARE(m_model->count(), 3); // Still all items are shown
+ QCOMPARE(itemsInModel(), QStringList() << "b.txt" << "c.txt" << "d.txt");
+
+ // Objects used to rename
+ const KFileItem fileItemC_txt = m_model->fileItem(1);
+ KFileItem fileItemC_cfg = fileItemC_txt;
+ fileItemC_cfg.setUrl(QUrl("c.cfg"));
+
+ const KFileItem fileItemD_txt = m_model->fileItem(2);
+ KFileItem fileItemA_txt = fileItemD_txt;
+ fileItemA_txt.setUrl(QUrl("a.txt"));
+
+ // Rename "c.txt" to "c.cfg"; and rename "d.txt" to "a.txt"
+ QCOMPARE(itemsRemovedSpy.count(), 0);
+ QCOMPARE(itemsChangedSpy.count(), 0);
+ m_model->slotRefreshItems({qMakePair(fileItemC_txt, fileItemC_cfg), qMakePair(fileItemD_txt, fileItemA_txt)});
+ QCOMPARE(itemsRemovedSpy.count(), 1);
+ QCOMPARE(itemsChangedSpy.count(), 1);
+ QCOMPARE(m_model->count(), 2); // Only "a.txt" and "b.txt". "c.cfg" got filtered out
+
+ QList<QVariant> arguments = itemsChangedSpy.takeLast();
+ KItemRangeList itemRangeList = arguments.at(0).value<KItemRangeList>();
+
+ // We started with the order "b.txt", "c.txt", "d.txt"
+ // "d.txt" started with index "2"
+ // "c.txt" got renamed and got filtered out
+ // "d.txt" index shifted from index "2" to "1"
+ // So we expect index "1" in this argument, meaning "d.txt" was renamed
+ QCOMPARE(itemRangeList, KItemRangeList() << KItemRange(1, 1));
+
+ // Re-sorting is done asynchronously:
+ QCOMPARE(itemsInModel(), QStringList() << "b.txt" << "a.txt"); // Files should still be in the incorrect order
+ QVERIFY(itemsMovedSpy.wait());
+ QCOMPARE(itemsInModel(), QStringList() << "a.txt" << "b.txt"); // Files were re-sorted and should now be in the correct order
+}
+
+
+/**
+ * Verifies that parental chains are hidden and shown as needed while their children get filtered/unfiltered due to renaming.
+ * Also verifies that the "isExpanded" and "expandedParentsCount" values are kept for expanded folders that get refreshed.
+ */
+void KFileItemModelTest::testRefreshExpandedFolderWithFilter() {
+ QSignalSpy itemsInsertedSpy(m_model, &KFileItemModel::itemsInserted);
+ QSignalSpy itemsRemovedSpy(m_model, &KFileItemModel::itemsRemoved);
+
+ QSet<QByteArray> modelRoles = m_model->roles();
+ modelRoles << "isExpanded" << "isExpandable" << "expandedParentsCount";
+ m_model->setRoles(modelRoles);
+
+ m_testDir->createFile("a/b/someFolder/someFile");
+
+ m_model->loadDirectory(m_testDir->url());
+ QVERIFY(itemsInsertedSpy.wait());
+
+ QCOMPARE(m_model->count(), 1); // Only "a/"
+
+ // Expand "a/".
+ m_model->setExpanded(0, true);
+ QVERIFY(itemsInsertedSpy.wait());
+
+ // Expand "a/b/".
+ m_model->setExpanded(1, true);
+ QVERIFY(itemsInsertedSpy.wait());
+
+ // Expand "a/b/someFolder/".
+ m_model->setExpanded(2, true);
+ QVERIFY(itemsInsertedSpy.wait());
+ QCOMPARE(m_model->count(), 4); // 4 items: "a/", "a/b/", "a/b/someFolder", "a/b/someFolder/someFile"
+
+ // Set a filter that matches the expanded folder "someFolder"
+ m_model->setNameFilter("someFolder");
+ QCOMPARE(m_model->count(), 3); // 3 items: "a/", "a/b/", "a/b/someFolder"
+
+ // Objects used to rename
+ const KFileItem fileItemA = m_model->fileItem(0);
+ KFileItem fileItemARenamed = fileItemA;
+ fileItemARenamed.setUrl(QUrl("a_renamed"));
+
+ const KFileItem fileItemSomeFolder = m_model->fileItem(2);
+ KFileItem fileItemRenamedFolder = fileItemSomeFolder;
+ fileItemRenamedFolder.setUrl(QUrl("/a_renamed/b/renamedFolder"));
+
+ // Rename "a" to "a_renamed"
+ // This way we test if the algorithm is sane as to NOT hide "a_renamed" since it will have visible children
+ m_model->slotRefreshItems({qMakePair(fileItemA, fileItemARenamed)});
+ QCOMPARE(m_model->count(), 3); // Entire parental chain must still be shown
+ QCOMPARE(itemsInModel(), QStringList() << "a_renamed" << "b" << "someFolder");
+
+ // Rename "a_renamed" back to "a"; and "someFolder" to "renamedFolder"
+ m_model->slotRefreshItems({qMakePair(fileItemARenamed, fileItemA), qMakePair(fileItemSomeFolder, fileItemRenamedFolder)});
+ QCOMPARE(m_model->count(), 0); // Entire parental chain became hidden
+
+ // Rename "renamedFolder" back to "someFolder". Filter is passing again
+ m_model->slotRefreshItems({qMakePair(fileItemRenamedFolder, fileItemSomeFolder)});
+ QCOMPARE(m_model->count(), 3); // Entire parental chain is shown again
+ QCOMPARE(itemsInModel(), QStringList() << "a" << "b" << "someFolder");
+
+ // slotRefreshItems() should preserve "isExpanded" and "expandedParentsCount" values explicitly in this case
+ QCOMPARE(m_model->m_itemData.at(2)->values.value("isExpanded").toBool(), true);
+ QCOMPARE(m_model->m_itemData.at(2)->values.value("expandedParentsCount"), 2);
+}
+
/**
* Verify that removing hidden files and folders from the model does not
* result in a crash, see https://bugs.kde.org/show_bug.cgi?id=314046
// Simulate the deletion of the directory "a/b/".
m_model->slotItemsDeleted(KFileItemList() << m_model->fileItem(1));
QCOMPARE(itemsRemovedSpy.count(), 2);
- QCOMPARE(m_model->count(), 1);
- QCOMPARE(itemsInModel(), QStringList() << "a");
+ QCOMPARE(m_model->count(), 0); // "a" will be filtered out since it doesn't pass the filter and doesn't have visible children
// Remove the filter -> only the file "a/1" should appear.
m_model->setNameFilter(QString());
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